Manley 100mm (+.5mm) Overbore Pistons Subaru WRX 2006-2014 / STI 2004-2021 | 612005C-4

Part #: 612005C - 4. These Manley forged and dished pistons for the EJ257 are crafted from high - strength 2618 material. They're lightweight but tough, offering a long service life. Each set comes free with round wire locks, tool steel wrist pins, and piston rings. A special multi - step top ring groove machining process ensures perfect control of the groove's size, shape, flatness, and finish. Precise pinhole machining guarantees an exact compression distance and accurate lock ring groove spacing, size, and concentricity. Manley pistons are available in standard size and a wide range of oversize/overbore options for any high - performance engine build. Note: All Manley pistons include a full set of four (4) pistons, piston rings, and hardware. FITMENT: Subaru STI 04+, 06+ WRX. Part Number: 612005C - 4 (100mm (+.5mm) Overbore, 8.5 Comp. Ratio).

Using these Manley pistons is straightforward. First, make sure your engine is suitable for the 100mm (+.5mm) overbore size and 8.5 compression ratio. Install the full set of four pistons, along with the included piston rings and hardware carefully. When installing, pay attention to the correct orientation of the pistons and rings. As for maintenance, keep your engine well - lubricated. Regularly check the pistons for any signs of wear or damage, like cracks or excessive wear on the rings. If you notice any issues, replace the parts promptly. Also, make sure to use high - quality engine oil and follow the manufacturer's recommended maintenance schedule for your Subaru WRX or STI.